During an argument,how far would you accept you opponent's own ideas and claims before you start your attack?have you ever stayed calm tell the end?

Making a useful bridge to your other excellent question about the relationship between business tactics and war tactics, I always try to follow this rule (not that it always works):

Don’t start a battle you know you will lose. By the same token, don’t start an argument you know you will lose. Get your stuff right and back up your deeds and words with proper prior thought first and documentation afterwards. If you're right, then you're right and you will go into any argument with invincible self-confidence. And if you're wrong, you will still have the chance of "winning" by admitting you're wrongdoing and leaving your opponent in "shock and awe", pretty plain and simple to me. "No need for spilling blood".

Off course real situation play a different scene and emotions can rise in seconds depending on your counterpart. But nothing beats the power of calm even during heated discussions or debates. It's the ultimate show of confidence that makes your opponents tremble.

Example:

It's no wonder that in many disciplines like politics, diplomacy and business life showing negative emotions of anger or defeat generally (universally) have a lasting stigma of a "weakness", while a calm discussion partner who uses the power of argument (or remorse) always comes out triumphantly as the winner.

It requires lots of patience and practice to reach this level of self-confidence, listen carefully, wait till the end, and prepare your answers taking into consideration what your opponent has just said !! 

from my point of veiw , i think to handle that or any status you face is by have skills of (( Good Listining )) as much you listen as much you can answer in order to know what the other parts needs in order you can answer accurate or lead him / her to the way of the answer.